Straits of Florida from west end of Seven Mile Bridge to south of Halfmoon Shoal out 20 to 60 NM Marine Forecast
| Overnight...East Winds Near 15 Knots, Becoming East To Southeast. Seas 2 To 4 Feet, Occasionally To 5 Feet. Wave Detail: East 4 Feet At 5 Seconds. |
| Tuesday...East To Southeast Winds Near 15 Knots Early, Becoming Eats And Decreasing To 10 To 15 Knots. Seas 2 To 4 Feet, Occasionally To 5 Feet. Wave Detail: East 3 Feet At 5 Seconds. A Slight Chance Of Showers And Thunderstorms. |
| Tuesday Night...East Winds 10 To 15 Knots. Seas 2 To 3 Feet. Wave Detail: East 3 Feet At 5 Seconds. A Slight Chance Of Showers And Thunderstorms. |
| Wednesday...East Winds Near 10 Knots. Seas 2 To 3 Feet. |
| Wednesday Night...East Winds 10 To 15 Knots. Seas 2 To 3 Feet. |
| Thursday...East Winds Near 10 Knots. Seas 1 To 2 Feet. A Slight Chance Of Showers And Thunderstorms. |
| Thursday Night...East Winds 10 To 15 Knots. Seas 2 To 3 Feet. |
| Friday...East Winds 10 To 15 Knots. Seas 2 To 3 Feet. A Chance Of Showers And Thunderstorms. |
| Friday Night...East Winds Near Increasing To 15 Knots. Seas Building To 3 To 4 Feet, Occasionally To 5 Feet. A Chance Of Showers And Thunderstorms. |
| Saturday...East Winds 10 To 15 Knots. Seas 3 To 4 Feet, Occasionally To 5 Feet. A Slight Chance Of Showers And Thunderstorms. |
| Saturday Night...East Winds Increasing To Near 15 Knots. Seas 3 To 5 Feet, Occasionally To 6 Feet. A Slight Chance Of Showers. |
| Area Forecast Discussion National Weather Service Key West FL 1030pm EDT Monday August 10 2026 Issued at 1030pm EDT Monday August 10 2026 CIMSS products shows deep mean layer ridging remains in place across much of the western North Atlantic extending westward into Florida and the Gulf. Marine observation platforms surrounding the Island Chain are recording east to southeast breezes of 10 to 15 knots as a result. GOES 19 Total Precipitable Water (TPW) products shows a slug of 1.3 to 1.5 inch PWATs (Precipitable Waters) across much of the Keys. KBYX radar has not detected shower activity for much of the afternoon and evening. The one caveat was across the far eastern Straits just outside of the Keys coverage area where a few pesky showers were able to develop between 8-10 pm. These have since dissipated. GOES 19 Nighttime Microphysics imagery shows mostly clear skies throughout the Keys with low level cumulus being the name of the game. Temperatures along the Island Chain are in the mid 80s and dew points are in the mid to upper 70s. Short Term - Tonight Through Friday CAST... The 00z evening sounding shows an unstable profile especially below the inversion around 825 mb. Above this layer, the Saharan Air Layer is in full effect with plenty of dry air and stable atmospheric column. Instability remains quite high with CAPE values measuring between 3200-3600 J/kg. The PWAT (Precipitable Water) value measured was 1.54 inches which is right at the 10th percentile for the date. The wind profile remains unidirectional out of the east between 15 to 20 knots in the lowest 3000 ft. Based on the above, any shower that do try and develop tonight will quickly entrain dry air as they try to grow vertically. However, due to the instability being so high, the potential for one of these to grow tall enough to produce lightning remains plausible, especially over the marine area. Therefore, no changes expected to the ongoing forecast with slight chance (10%) remaining. Marine Issued at 1030pm EDT Monday August 10 2026 There are currently no watches, warnings, or advisories in effect across the Florida Keys coastal waters. From synopsis, ridging across northern Florida will steadily shift southwards into Central and South Florida over the next few days. Gentle to moderate breezes will gradually trend downwards to a light to gentle breeze through this period. Winds are expected to freshen late in the week and over the start of the weekend as the ridge lifts back into northern Florida and a broad lower level trough moves westward across our area. NOAA Key West FL Office: Watches - Warnings - Advisories FL...None. GM...None. |
Key West FL Radar
Southeast Radar